How severe is CVE-2024-51139?

CVE-2024-51139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-51139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-51139?

CVE-2024-51139 primarily affects Draytek Vigor2620 Firmware. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-51139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-51139 have an EU (EUVD) identifier?

Yes. CVE-2024-51139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5949.

When was CVE-2024-51139 published?

CVE-2024-51139 was published on 2025-02-27 and last updated on 2026-07-05.

CVE-2024-51139

CVE-2024-51139 is a critical-severity vulnerability in Draytek Vigor2620 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-5949
Weakness: CWE-120
Affected product: Draytek Vigor2620 Firmware
Published: 2025-02-27
Last modified: 2026-07-05

Description

Buffer Overflow vulnerability in Vigor2620/LTE200 3.9.8.9 and earlier and Vigor2860/2925 3.9.8 and earlier and Vigor2862/2926 3.9.9.5 and earlier and Vigor2133/2762/2832 3.9.9 and earlier and Vigor165/166 4.2.7 and earlier and Vigor2135/2765/2766 4.4.5.1 and earlier and Vigor2865/2866/2927 4.4.5.3 and earlier and Vigor2962/3910 4.3.2.8/4.4.3.1 and earlier and Vigor3912 4.3.6.1 and earlier allows a remote attacker to execute arbitrary code via the CGI parser's handling of the "Content-Length" header of HTTP POST requests.

Frequently asked questions

What is CVE-2024-51139?: Buffer Overflow vulnerability in Vigor2620/LTE200 3.9.8.9 and earlier and Vigor2860/2925 3.9.8 and earlier and Vigor2862/2926 3.9.9.5 and earlier and Vigor2133/2762/2832 3.9.9 and earlier and Vigor165/166 4.2.7 and earlier and Vigor2135/2765/2766 4.4.5.1 and earlier and Vigor2865/2866/2927 4.4.5.3 and earlier and Vigor2962/3910 4.3.2.8/4.4.3.1 and earlier and Vigor3912 4.3.6.1 and earlier allows a remote attacker to execute arbitrary code via the CGI parser's handling of the "Content-Length" header of HTTP POST requests.
How severe is CVE-2024-51139?: CVE-2024-51139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-51139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-51139?: CVE-2024-51139 primarily affects Draytek Vigor2620 Firmware. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-51139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-51139 have an EU (EUVD) identifier?: Yes. CVE-2024-51139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5949.
When was CVE-2024-51139 published?: CVE-2024-51139 was published on 2025-02-27 and last updated on 2026-07-05.

References

https://medium.com/faraday/advisory-multiple-vulnerabilities-affecting-draytek-routers-78a6cb8b3946

EU advisories (EUVD)

http://draytek.com

Affected products (23)

cpe:2.3:o:draytek:vigor2620_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigorlte200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2860_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2925_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2862_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2926_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2133_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2762_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2832_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2135_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2765_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2766_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2763_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2865_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2866_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2927_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2962_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor3910_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor3912_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2915_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor1000b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor2952_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:draytek:vigor3220_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Draytek Vigor2620 Firmware

CVE-2024-51138 — Critical (CVSS 9.8): Vigor165/166 4.2.7 and earlier; Vigor2620/LTE200 3.9.8.9 and earlier; Vigor2860/2925 3.9.8 and earlier; Vigor2862/2926…
CVE-2024-41593 — Critical (CVSS 9.8): DrayTek Vigor310 devices through 4.3.2.6 allow a remote attacker to execute arbitrary code via the function…
CVE-2023-31447 — Critical (CVSS 9.8): user_login.cgi on Draytek Vigor2620 devices before 3.9.8.4 (and on all versions of Vigor2925 devices) allows attackers…
CVE-2024-41339 — High (CVSS 8.8): An issue in the CGI endpoint used to upload configurations in Draytek devices Vigor 165/166 prior to v4.2.6 , Vigor…
CVE-2024-41334 — High (CVSS 8.8): Draytek devices Vigor 165/166 prior to v4.2.6 , Vigor 2620/LTE200 prior to v3.9.8.8, Vigor 2860/2925 prior to v3.9.7,…
CVE-2024-41340 — High (CVSS 8.4): An issue in Draytek devices Vigor 165/166 prior to v4.2.6 , Vigor 2620/LTE200 prior to v3.9.8.8, Vigor 2860/2925 prior…

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